Sheet metal & Air Conditioning Contractors’ National Association

About SMACNA

The Sheet Metal and Air Conditioning Contractors’ National Association (SMACNA) is an international trade association representing 1,834 member firms in 103 chapters throughout the United States, Canada, Australia, and Brazil.  A leader in promoting quality and excellence in the sheet metal and air conditioning industry, SMACNA has offices in Chantilly, VA., which is outside of Washington, D.C., and on Capitol Hill. 

Who We Are

SMACNA members perform work in industrial, commercial, institutional, and residential markets. They specialize in the following:  

Our Contractors Set the Standards for the Industry

The voluntary technical standards and manuals developed by SMACNA Contractors are accepted worldwide by the construction community, as well as foreign government agencies. ANSI, the American National Standards Institute, has accredited SMACNA as a standards-setting organization. SMACNA does not seek to enforce its standards or provide accreditation for compliance.

SMACNA standards and manuals address all facets of the sheet metal industry, from duct construction and installation to air pollution control, energy recovery and roofing. Shop the standards available in the store.

How We Help our Members

The association offers contractors professional assistance in the following areas: